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Research Article SEASONAL INVESTIGATION of ATMOSPHERIC DESERT DUST AFFECTING SANLIURFA USING MODIS SATELLITE and HYSPLIT MODEL DATA

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Research Article SEASONAL INVESTIGATION of ATMOSPHERIC DESERT DUST AFFECTING SANLIURFA USING MODIS SATELLITE and HYSPLIT MODEL DATA Sigma J Eng & Nat Sci 36 (3), 2018, 905-916 Sigma Journal of Engineering and Natural Sciences Sigma Mühendislik ve Fen Bilimleri Dergisi Research Article SEASONAL INVESTIGATION OF ATMOSPHERIC DESERT DUST AFFECTING SANLIURFA USING MODIS SATELLITE AND HYSPLIT MODEL DATA Tuba RASTGELDİ DOĞAN*1, Mehmet İrfan YEŞİLNACAR2, Mehmet Ali ÇULLU3 1Harran University, Department of Environmental Engineering, SANLIURFA;ORCID:0000-0002-8246-388X 2Harran University, Department of Environmental Engineering, SANLIURFA;ORCID:0000-0001-9724-8683 3Harran University, Dep. of Soil Science and Plant Nutrition, SANLIURFA; ORCID:0000-0002-9641-3867 Received: 19.07.2018 Revised: 03.09.2018 Accepted: 10.09.2018 ABSTRACT Million tons of dust are transported every year primarily from the Sahara Desert, Syria and Arabian Peninsula, which are close to Turkey. In this study, Sanlıurfa, was selected as an observation station to investigate the extent of long range transport of dust influencing Southeastern Anatolia Region for the first time. Hence, PM10 and PM2.5 types of dust were collected into filters through dust collection device during 2012 year and the amount was determined. The source of the dust at 500, 1000 and 1500 meters, also, was analyzed using the model of HYSPLIT. MODIS aerosol product was used for satellite images of dusty days. The source of these dusts carried over long distances was found, with HYSPLIT, to be Sahara Desert in particular, Syrian desert and deserts in the Arabian Peninsula. Dust collected daily through dust collection device into PM10 and PM2.5 -3 -3 filters was found to come more frequently in transition seasons of as PM10 of 550 µg m , PM2.5 of 213 µg m -3 -3 in spring; as PM10 of 620 µg m , PM2.5 of 240 µg m in autumn which are all above the minimum standard levels (50 µg m-3) accepted by the WHO. Keywords: Air quality, desert dust, atmospheric particulate matter, hybrid single-particle lagrangian integrated trajectory model (HYSPLIT), moderate resolution imaging spectroradiometer (MODIS) satellite. 1. INTRODUCTION The main part of aerosol mass loading is constituted by dust released into the atmosphere through surface winds originated from dry soils [1]. Almost 20% of the earth’s surface is formed by arid and hyperarid areas near the boundaries of deserts [2]. Suspended dust is transmitted inside the atmospheric wind flow in the air. The dust residence time in the atmosphere, which is partially similar to the dust life time, altitude of dust layer, prevailing atmospheric circulation characteristics, and buoyancy and gravitational forces, determines the transport distance to a large extent. On the other hand, it is assumed that particles with 70 μm and larger sizes deposit in a period of time which is almost one day. Atmospheric turbulence allows only finest particles with 70 μm diameter and less to be kept aloft, and these particles * Corresponding Author: e-mail: [email protected], tel: (414) 318 30 00 / 1262 905 T. Rastgeldi Doğan, M.İ. Yeşilnacar, M.A. Çullu / Sigma J Eng & Nat Sci 36 (3), 905-916, 2018 can stay in the atmosphere for some weeks and eventually be carried along a great distance downwind [3]. Still, so called ‘giant’ particles which have a size of >100 μm sometimes exist at distant areas (>1000 km) [4, 5]. There is a growing scientific interest in global emission, transport and features of dust from desert areas carried globally as a result of crustal aerosols’ climatic and biogeochemical impacts. The Sahara is a primary source of dust among the deserts in the globe with its emissions estimated in the range of 600–700×106tonnes per year [6, 7]. The dust originating from Sahara is the most important natural origin of particulate matter (PM), with around 2 × 108tons of aerosols produced per year, which are transported towards the Atlantic Ocean, to the Mediterranean Sea and Southern Europe [8, 9]. Thirteen events on average per year were detected over the Iberian Peninsula preferably during May to August [10, 11]. [12] reported about 5–15 incidences per year over southern Germany. These events are explained through a mid-latitude disturbance in the North African continent [13, 14]. In the Mediterranean, a correlation has been determined between high levels of PM10 and the African dust intrusion [15]. It has been shown in one of the latest studies that contribution of African dust to PM10 concentration declines exponentially with latitude (from south to north) and increases longitudinally from 25°E eastwards [16]. The tropospheric aerosol mass is largely composed of mineral dust aerosol, which consequently has an effect on the climate of the Earth and the atmospheric characteristics in many ways. The tropospheric aerosol mass is largely composed of mineral dust aerosol, which consequently has an effect on the climate of the Earth and the atmospheric characteristics in many ways. Mineral dust aerosol can influence the climate in a direct or an indirect way, nutritional system in sea environments and processes about geochemistry. Furthermore, a strong association has been identified in epidemiologic studies considering the particulate matter with serious problems of health like diseases about respiratory and cardiovascular system, cardiovascular diseases, pulmonary and systemic inflammation, lung cancer and even death [17, 18]. World Heath Organization (WHO) and European Commission Directive 2008/50/EC set threshold limits both for PM10 and PM2.5 to protect public health. WHO –3 sets 24-h average and annual limit values for PM10 as 50 and 20 µg m , respectively, while those –3 for PM2.5 are 25, and 10 µg m , respectively. Threshold limits set by the European Commission –3 for annual and 24-h average PM10 are 50 and 40 µg m , respectively, whilst annual average PM2.5 limit was determined as 25 µg m–3. The purpose of this study is to highlight the impact of long-range dust transport on the observed PM mass concentrations. To end this, PM samples were collected during 2012 at Sanlıurfa, which is located at the intersection of dust transport routes. 2. MATERIALS AND METHODS 2.1. Study Area Located in Southeastern Anatolia Region with a Syria border, Sanlıurfa has a semi-arid climate, which tends to have hot summers and warm winters considering the data of 42 years obtained from directorate of meteorology. It shows the features of a semi-desert climate owing to the difference between daytime and night time temperatures, which increases particularly in transitional seasons of spring and autumn. Sanlıurfa is a significant city since it is in the intersection of air flows from large deserts such as Sahara, Syria and Arabian Peninsula (Figure 1c) which leads very frequent PM exceedances within the city. Gent PM10 Stack Filter Unit (SFU) sampler operating in accordance with the EPA standard was deployed in this study to collect PM2.5 and PM10 samples, simultaneously. Sampler was located in Environmental Engineering Department of Harran University (Sanlıurfa, Turkey) (37.17o N -39.00o E and 550 Elevation) at a height of 10 m. Sampling location is depicted in Figure 1a and 1b. The study area was carefully selected by ensuring that it is away from the main 906 Seasonal Investigation of Atmospheric Desert … / Sigma J Eng & Nat Sci 36 (3), 905-916, 2018 road, it is not located in the area of industrial organizations and the content and amount is not affected by any particles as Harran University has a fuel-oil heating system. Figure 1. (a) Study area where PM sampler was located, (b) Location of Sanlıurfa, (c) Main directions where dust transported to Sanlıurfa 2.2. Sample Collection Gent type PM10 stacked filter unit (SFU) sampler includes two diameter filter holders sized 47mm, placed in series. The first holder’s upstream is a pre impaction stage intercepting particles with 10 mm and larger sizes equivalent aerodynamic diameter (EAD). Operation of the sampler is a flow rate of 16 L min-1 to gather particulates with an EAD which has 10 mm and less size in separate coarse (2.5–10 mm EAD) and fine (2.5 mm EAD) size fraction on two sequential 47mm diameter Nuclepore filters. The first filter holder and the second holder are loaded with an an 8 mm pore size (Apiezon coated) Nuclepore polycarbonate filter and 0.4 mm pore size Nuclepore filter, respectively [19]. A 100 laminar air flow cabinet (clean dust free) was used to perform the loading and unloading of the filters in order to reduce the possibility of contamination. Starting date of the sampling is in January 2012, and finished in December 2012. In the course of this period, 730 aerosol filter samples in total were collected with a temporal resolution of 24 h. 2.3. HYSPLIT Backward Trajectories Possible source areas have been assigned through the HYSPLIT model of the US National Oceanic and Atmospheric Administration (NOAA). Computations of air parcel backward trajectories to Sanlıurfa at 9:00 UTC are carried out for altitudes at 500 m intervals up to 6.5 km, 907 T. Rastgeldi Doğan, M.İ. Yeşilnacar, M.A. Çullu / Sigma J Eng & Nat Sci 36 (3), 905-916, 2018 and for up to 315 h. These are conducted through the Windows-based version 4.9 of the model. Vertical velocity fields of the meteorological model provide the vertical motion. For the model input, The National Centers for Environmental Prediction (NCEP) reanalysis data is utilized [20]. Information on prevailing meteorological incidences in the transport is provided by means of the slope of the vertical component of trajectories that are shown in the lower panel of the backward trajectory plots. Another significant parameter, together with how often and in what amount the dust comes, is to identify the source from which the dust originates in order to determine its chemical and physical characteristics.
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